Drainage culvert

ABSTRACT

An open slot culvert for positioning in a drainage area with the open slot at the top so that any surface drainage water will flow through the slot and directly into the culvert, including a method and apparatus for its manufacture. The improved open slot culvert comprises a metallic, pipe section, split longitudinally along its upper side to form a narrow slot, and grate means, including two spaced, vertical bearing members joined by spacer means, secured in the slot. The method of making the improved open slot culvert includes the steps of providing two elongated, parallel, vertical members in spaced relation having a plurality of spacer means therebetween, longitudinally splitting the upper side of a metallic pipe section to form a narrow slot, and properly positioning the grate means within the narrow slot. The apparatus for making the improved open slot culvert generally comprises an entry pipe station, a pipe clamp, saw and tack welding station, and a finish welding and exit station.



1. An open slot culvert of improved ring compression strength, for positioning in a drainage area with the open slot at the top so that any surface drainage water will flow through the slot and directly into the culvert, the culvert being satisfactorily back filled by utilizing any suitable maTerial with the upper surface of the drainage area substantially on a level with the upper surface of the open slot of the culvert, which comprises a metallic pipe section split longitudinally along its upper side to form a narrow slot, and grate means secured in said slot, said grate means comprising two spaced, vertical bearing members substantially normal to the axis of said pipe section and extending longitudinally over the major portion of the length of said slot, the major portion of each said bearing member extending transversely above the neutral axis of the pipe section wall, said bearing members being secured to said pipe section by fillet welds joining the surface of said vertical bearing members and said pipe section and being joined by spacer means substantially normal to said vertical bearing members and substantially at the neutral axis of the pipe section wall so as to provide improved ring compression strength.
 1. An open slot culvert of improved ring compression strength, for positioning in a drainage area with the open slot at the top so that any surface drainage water will flow through the slot and directly into the culvert, the culvert being satisfactorily back filled by utilizing any suitable maTerial with the upper surface of the drainage area substantially on a level with the upper surface of the open slot of the culvert, which comprises a metallic pipe section split longitudinally along its upper side to form a narrow slot, and grate means secured in said slot, said grate means comprising two spaced, vertical bearing members substantially normal to the axis of said pipe section and extending longitudinally over the major portion of the length of said slot, the major portion of each said bearing member extending transversely above the neutral axis of the pipe section wall, said bearing members being secured to said pipe section by fillet welds joining the surface of said vertical bearing members and said pipe section and being joined by spacer means substantially normal to said vertical bearing members and substantially at the neutral axis of the pipe section wall so as to provide improved ring compression strength.
 2. The culvert according to claim 1, wherein said spacer means comprises a plurality of cross bar spacers.
 3. The culvert according to claim 1, wherein said spacer means comprises a sinusoidal member.
 4. The culvert according to claim 1, wherein said pipe section has a protective coating and is helically corrugated and continuously butt welded on a helical angle such that the outside surface thereof across said weld is smooth and free from discontinuities.
 5. The culvert according to claim 1, wherein said pipe section has a protective coating and is annularly corrugated.
 6. The culvert according to claim 1, wherein said fillet welds are provided with a protective coating.
 7. The culvert according to claim 6, wherein said protective coating comprises zinc.
 8. The culvert according to claim 6, wherein said protective coating comprises an asphalt base paint.
 9. The culvert according to claim 1, wherein said grate means is galvanized as a unit. 